<?php

declare(strict_types=1);

namespace App\Modules\Invoices;

use App\Core\{Request, Response};
use App\Services\FileStorageService;
use App\Services\AiExtractionService;
use App\Modules\Invoices\InvoiceModel;
use Throwable;

final class InvoiceController
{
    public function __construct(
        private readonly InvoiceModel $invoiceModel,
        private readonly FileStorageService $storage,
        private readonly AiExtractionService $aiExtraction
    ) {}

    public function list(Request $request): void
    {
        $tenantId = $request->tenantId;
        $role = $request->user->role ?? 'viewer';
        $assignedCompanyId = $request->user->assigned_company_id ?? null;

        if ($role === 'super_admin') {
            $invoices = $this->invoiceModel->findByTenant($tenantId);
        } else {
            // Filter by assigned company for admin, accountant, etc.
            $db = \App\Core\Database::getInstance();
            $stmt = $db->prepare("SELECT * FROM invoices WHERE tenant_id = ? AND company_id = ? AND deleted_at IS NULL ORDER BY created_at DESC");
            $stmt->execute([$tenantId, $assignedCompanyId]);
            $invoices = $stmt->fetchAll();
        }

        Response::json([
            'success' => true,
            'data' => $invoices
        ]);
    }

    public function upload(Request $request): void
    {
        $files = $request->getFiles();
        if (empty($files['invoice'])) {
            Response::error('يرجى اختيار ملف الفاتورة', 'MISSING_FILE', 422);
            return;
        }

        $companyId = $request->input('company_id');
        if (!$companyId) {
            Response::error('يرجى تحديد الشركة', 'MISSING_COMPANY', 422);
            return;
        }

        try {
            $tenantId = $request->tenantId;
            $filePath = $this->storage->store($files['invoice'], $tenantId, $companyId);
            $fileHash = $this->storage->getHash($filePath);

            // Create invoice record
            $invoiceId = \Ramsey\Uuid\Uuid::uuid4()->toString();
            $this->invoiceModel->create([
                'id' => $invoiceId,
                'tenant_id' => $tenantId,
                'company_id' => $companyId,
                'uploaded_by' => $request->user->user_id,
                'status' => 'uploaded', // Match schema ENUM
                'original_file_path' => $filePath,
                'original_file_hash' => $fileHash,
                'idempotency_key' => bin2hex(random_bytes(16))
            ]);

            // Attempt AI Extraction
            try {
                $mimeType = mime_content_type($filePath);
                $extractedData = $this->aiExtraction->extractInvoiceData($filePath, $mimeType);
                
                // Update Invoice with extracted data
                $this->invoiceModel->update($invoiceId, [
                    'status' => 'extracted', // Match schema ENUM
                    'ai_raw_response' => json_encode($extractedData, JSON_UNESCAPED_UNICODE)
                ]);

                Response::json([
                    'success' => true,
                    'data' => [
                        'invoice_id' => $invoiceId,
                        'extracted_data' => $extractedData
                    ],
                    'message' => 'تم رفع الفاتورة واستخراج البيانات بنجاح بالذكاء الاصطناعي'
                ]);

            } catch (Throwable $aiError) {
                // Keep it uploaded, maybe manual retry later
                $this->invoiceModel->update($invoiceId, [
                    'status' => 'validation_failed' // Match schema fallback
                ]);
                
                Response::json([
                    'success' => true,
                    'data' => ['invoice_id' => $invoiceId],
                    'message' => 'تم الرفع ولكن فشل استخراج البيانات. ' . $aiError->getMessage()
                ]);
            }

        } catch (Throwable $e) {
            Response::error($e->getMessage(), 'UPLOAD_FAILED', 500);
        }
    }
}